Bug 31842: Fix DT search error on col.data.split

Bug 31842: Fix DT search error on col.data.split

Set searchable to false for opac_info.

Test plan:
Check if DT search for libraries works again.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
[EDIT] Reverted the data/render function change as requested
by Jonathan. Considering the fact that dataTables or custom
extensions do not check col.data.split as a clear bug btw.
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>